I^ecomhi nation of Ion.< in Air and Teuipevatiire of Air. 663 



range of densities of the air oecnrrino- in this instance, this 

 same law of recombination liolds true. Tlierefore in this 

 case the validity of th(^ ])roof of the law at the various 



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•35 -40 -44 



•60 



Time in sec. 

 temperatures is not affected by the change of density of the 

 air. Taking into consideration the present experiments in 

 connexion with the previous investigation on pressure, this 

 law of recombination of ions in air appears to be a universal 

 one, at least within the range of temperatures and pressures 

 that have been investisrated. 



